Don’t play the blame game. It is much to easy to blame people or things for a situation that cannot be helped. Blaming people and being pessimistic only makes the situation worse. It may strain good relationships and it will make yourself look awful. People worry about looking stupid when something unexpected comes up, but don’t worry. Explain the situation and why things have to be changed. Be positive about having to change the plans. With a good attitude, people will respect your resilience and your way of dealing with problems.